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$\begingroup$ +1, but one nit. "Weight" is a force, not a pressure. As you point out, you get a pressure when you distribute that force over the area of a football field. $\endgroup$
– mmesser314
Commented Jan 11, 2022 at 14:52
$\begingroup$ True, corrected. $\endgroup$
– Codename 47
Commented Jan 11, 2022 at 14:54
1

$\begingroup$ Football fields are generally not very reflective, so you should reduce that factor of 2. $\endgroup$
– PM 2Ring
Commented Jan 11, 2022 at 15:18
2

$\begingroup$ "Force is also defined as change in momentum" - is this correct? I would say change in momentum is impulse (= force x time) $\endgroup$
– Martin CR
Commented Jan 11, 2022 at 15:20
2

$\begingroup$ @PM2Ring The albedo of grass is about .25 so to be even more accurate the factor should be 1.25 rather than 1 $\endgroup$
– Kevin
Commented Jan 13, 2022 at 17:43

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